New Bigger Air Filter fit for Honda 400 Foreman 1995-2003 and 450 TRX450S 450ES 1998-2004 New high quality aftermarket air filter Bigger air filter: O.D. 114mm and inner throat diameter is 66mm Package including 1 air filter with clamp The listed one is bigger one, we also have a smaller for this air filter, size: O.D. is 104mm and inner throat diameter is 54mm, ASIN is B00IMT76WG, please compare it with your original before ordering it. IMPORTANT: Honda uses a 2 stage filter, the first stage is called the pre-filter and is a foam case, then inside is a metal frame with screen that serves as the second stage. We are just selling the pre-filter only, our filter needs to be used with the metal frame from the original air filter and that it is a pre-filter only. so when you select the size you need to be aware we are not selling a complete 2 stage filter. when you measure you would measure the clamp point on the metal frame and not the out put flange going to the engine.